Arrangement in parallel operation of transductors



June 11, 1957 G. SONESSON 2,795,754

ARRANGEMENT IN PARALLEL OPERATION OF TRANSDUCTORS Filed July 30,1953

/nvenfqr Georg fimesso EW W United States Patent ARRANGEMENT IN PARALLEL OPERATION OF TRANSDUCTORS Georg Sonesson, Enskede, Sweden, assignor to Allmiinna Svenska Elektriska Aktiebolaget, Vasteras, Sweden Application July 30, 1953, Serial No. 371,273 Claims priority, application Sweden August 6, 1952 3 Claims. (Cl. 323-89) The present invention refers to an arrangement where a number of mainly identical loads are fed each via one transductor which consists of parallel-connected transductor elements self-magnetized through valve elements arranged in series with the alternating current windings of the transductor, and where the transductors are parallel-connected to the same line voltage. The arrangement is of special value in transductor regulation of discharge lamps. When operating a great number of such lamps, they are normally arranged in groups, and each group is controlled by one transductor. A specially suitable connection at such transductors consists in using valve elements in series with the alternating current windings, as the type of self-magnetization obtained thereby constructively is very simple and provides the transductor with favorable properties. Each such transductor therefore needs two valve elements.

By arranging two valve elements which are common to all parallel-connected transductors according to the present invention, several valuable advantages are gained. The manufacture of the installation is rendered simpler and cheaper, and in addition the possibility of incorrect connections is reduced when the transductors are connected. The maintenance of the installation is considerably simplified as only two valve elements are necessary for the complete installation. A valuble feature of the invention is that no individual trimming is required at the separate transductor units, as the current is the same in all the units.

On the accompanying drawing, two forms of the invention are shown. Fig. 1 shows transductors with separate windings for direct current magnetization, and Fig. 2 shows direct current magnetization across the self-magnetization valves.

Fig. 1 shows two loads 1 and 2, on one hand connected to a conductor 3, attached to one pole 4 of an alternating current source, and on the other hand each to one transductor 5, 6. The alternating current windings 7, 8 and 9, 10 within each transductor are connected in parallel, and the windings 7 and 9 are connected to the common conductor 11, whereas the windings 8 and 10 are connected to the conductor 12. Between the conductors 11 and 12 two valve elements 13 and 14 are connected in series and the junction point of the latter is connected "ice to the other pole 24 of the alternating current source. The transductors are further provided with direct current windings 15, 16 and 17, 18, respectively, series-connected within each transductor. The direct current windings are parallel-connected to the common conductors 19 and 20, which are connected to a direct current source at the terminals 22 and 23 via a potentiometer 21.

Instead of providing each transductor with two valve elements for self-magnetization, as hitherto known, now only two valve elements 13 and 14 are provided, common to all transductors. Of course there is nothing to prevent that more than the two transductors shown in the figure are connected to the common conductors 3, 11, 12, 19 and 20. It is obvious that the shown arrangement of the valve elements 13 and 14 involves great advantages from the point of view of installation.

Fig. 2 shows a modification concerning the arrangement of the transductors, as no separate direct current windings are provided. In this case an adjustable direct current voltage is supplied to the transductor windings across the valve elements 13, 14 via the potentiometer 21 from the terminals 22 and 23. By this arrangement the advantages of the invention clearly appear, as only three main conductors 3, 11, 12 are necessary for the transductors.

I claim as my invention:

1. An arrangement for the simultaneous control of the electric power in a plurality of loads, comprising a source of alternating current, a plurality of current circuits, an equal number of self-magnetized transductors each com prising two magnetic core paths and two power windings, each current circuit including a load and the parallelconnected power windings of one of the said transductors, the free terminals of all of said loads being connected in parallel to one terminal of the said source of alternating current, and two half-wave rectifier elements of opposite direction connected between the other terminal of the alternating current source and either of the parallel-connected free terminals of the power windings of the transductors.

2. Arrangement according to claim 1, in which each transductor is provided with a separate direct current magnetization winding, a direct current source, a member for adjusting the voltage of said source connected to said source, said direct current windings being connected to said member.

3. Arrangement according to claim 1, in which a direct current source is provided, a member for adjusting the voltage of said source connected to said source, conductors supplying said adjusted direct current voltage in parallel with both said valve elements.

References Cited in the file of this patent Book: The Transductor Amplifier, by Ulrik Krabbe, published by Lindhska Boktryckerit, Orebro, Sweden, 1947, Fig. 4, on page 28 and description. 

